Added changelog entry

Author: Julian Rex

platform/ios/CHANGELOG.md

@@ -41,6 +41,7 @@ Mapbox welcomes participation and contributions from everyone. Please read [CONT
 * Deprecated variants of the above methods without completion handlers. ([#14959](https://github.com/mapbox/mapbox-gl-native/pull/14959))
 * Fixed an issue where the two-finger tilt gesture would continue after lifting one finger. ([#14969](https://github.com/mapbox/mapbox-gl-native/pull/14969))
 * Added `MGLMapView.compassView.visibility` and `MGLOrnamentVisibility` to allow configuration of compass visibility behavior. ([#15055](https://github.com/mapbox/mapbox-gl-native/pull/15055))
+* Fixed a bug where using the pinch gesture could result in an incorrect map center coordinate. ([#15097](https://github.com/mapbox/mapbox-gl-native/pull/15097))
 
 ## 5.1.0 - June 19, 2019